grade standard technical grade, reagent grade physical state powder usage commerical, industrial manganese(ii) acetate is the chemical compound with the formula mn(ch₃coo)₂. It is used as a desiccant, a catalyst, and as fertilizercas number : 638-38-0 (anhydrous) / 6156-78-1 (tetrahydrate)appearance: white crystals (anhydrous); light pink monoclinic crystals (tetrahydrate)